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S1075 t1_j7dbsqu wrote

The flow is overwhelmingly west to east in the northern hemisphere, but it's still just a saying. It's never going to be scientifically accurate.

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ppitm t1_j7dlk7w wrote

It's scientifically accurate-ish. The idea is that the dawn sun shines on the underside of the band of clouds about to dump rain and wind on you. While the setting sun demonstrates that approaching clouds are just a narrow band, not a major system. Ergo the weather will pass by in the night and tomorrow will be fine.

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